/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.rpc.config;

import org.apache.dolphinscheduler.rpc.base.RpcService;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;

import org.reflections.Reflections;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * ServiceBean find all rpcService
 */
public class ServiceBean {

  private static final Logger logger = LoggerFactory.getLogger(ServiceBean.class);

  private static Map<String, Class> serviceMap = new HashMap<>();

  private static AtomicBoolean initialized = new AtomicBoolean(false);

  private ServiceBean() {
    throw new IllegalStateException("Utility class");
  }

  private static synchronized void init() {
    // todo config
    if (initialized.get()) {
      return;
    }
    Reflections f = new Reflections("org/apache/dolphinscheduler/");
    List<Class<?>> list = new ArrayList<>(f.getTypesAnnotatedWith(RpcService.class));
    list.forEach(rpcClass -> {
      RpcService rpcService = rpcClass.getAnnotation(RpcService.class);
      serviceMap.put(rpcService.value(), rpcClass);
      logger.info("load rpc service {}", rpcService.value());
    });
    initialized.set(true);
  }

  public static Class getServiceClass(String className) {
    if (initialized.get()) {
      return serviceMap.get(className);
    } else {
      init();
    }
    return serviceMap.get(className);
  }

}
